Funding for this research was provided by:
Chonnam National University (CRI 18 90*-1 BCR118026)
Article History
Received: 27 July 2018
Accepted: 24 June 2019
First Online: 5 July 2019
Ethics approval and consent to participate
: This study was approved by the institutional review board in Chonnam National University Hwasun Hospital. Patient informed consent was waived because of the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.